Pension Schedule of Amounts Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Actuarial gain (loss)	$ 1,544	$ 1,587	$ (1,163)
Amortization of prior service credit included in net periodic benefit cost	(3)	(7)	(13)
Settlement gain	0	5	0
Pension Plan [Member]
Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Actuarial gain (loss)	1,944	1,694	(1,482)
Defined Benefit Plan, Amortization of Gain (Loss)	536	476	596
Amortization of prior service credit included in net periodic benefit cost	0	0	0
Settlement gain	0	5	0
Total recognized in other comprehensive income (loss)	(1,408)	(1,223)	2,078
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	506
Other Postretirement Benefit Plan
Amounts Recognized in Other Comprehensive Income (Loss) [Abstract]
Actuarial gain (loss)	(400)	(107)	319
Defined Benefit Plan, Amortization of Gain (Loss)	0	7	60
Amortization of prior service credit included in net periodic benefit cost	(3)	(7)	(13)
Settlement gain	0	0	0
Total recognized in other comprehensive income (loss)	$ 397	$ 107	$ (272)